12271849891 has 16 divisors (see below), whose sum is σ = 14916593664. Its totient is φ = 9855563904.

The previous prime is 12271849867. The next prime is 12271849901. The reversal of 12271849891 is 19894817221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12271849891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12271849591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204685 + ... + 257758.

It is an arithmetic number, because the mean of its divisors is an integer number (932287104).

Almost surely, 2^12271849891 is an apocalyptic number.

12271849891 is a deficient number, since it is larger than the sum of its proper divisors (2644743773).

12271849891 is a wasteful number, since it uses less digits than its factorization.

12271849891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462690.

The product of its digits is 580608, while the sum is 52.

The spelling of 12271849891 in words is "twelve billion, two hundred seventy-one million, eight hundred forty-nine thousand, eight hundred ninety-one".